Easy
Less than 15 minutes
O-rings are designed to contain thousands of pounds of pressure by creating a seal between two or more parts. O-ring measurements are defined by the inside diameter and the thickness.
There are many causes for O-Ring failure, such as pressure, friction, temperature or chemicals. The most common are:
O-ring A00104
OEM part for: Porter Cable
Part Number: A00104
$4.99
In Stock
Order within the next 11 hours and your part ships today! 
Jump To:
Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This O-ring will fit the following 10 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 10 of 10 matching models.
Porter Cable
10 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Porter Cable
This item works with the following types of products:
- Nailer
- Stapler
This part replaces obsolete part #: 894747
Customer Part Reviews ?
Average Rating (out of 5):
Click to filter by ratings:
5 stars
47
4 stars
6
3 stars
2
2 stars
0
1 stars
1
< PREV
- 1
- 2
- 3
O ring.
O ring is made of good quality and easy to install.
Guest -
July 24, 2024
Verified Purchase
Easy repair
Right part easy to replace
Guest -
December 14, 2023
Verified Purchase
perfect
perfect fit
Terrence W. -
September 18, 2023
Verified Purchase
porter cable air tool.
the O-ring for my T-Nailer gun went bad, Replacement Parts had the O-ring. So i can keep my T-Nailer for twenty more years.
Guest -
September 14, 2023
Verified Purchase
Crown staple repair
Part arrived quickly and fit perfect in my crown stapler, will buy from again if in need of parts
Guest -
August 19, 2023
Verified Purchase
Fixed
Easy fix, got me up and running again thanks e replacement parts.com
Guest -
May 27, 2023
Verified Purchase
What I needed, when I needed it.
Perfect part, easy to find, quick delivery.
Guest -
February 20, 2023
Verified Purchase
A perfect replacement
This part along with a couple of O-rings fixed my staple gun like new. My air tools are getting old, like me, and parts wear out or Sub come to drying out, that's what happened to my, tool. As I stated any tool can be repaired with the correct part, eReplacementParts is the Goto for those parts!!
James -
January 11, 2023
Verified Purchase
Easy repair
Part arrived as scheduled. Fit perfectly and seems to have solved the problem. Would not hesitate to order more parts if needed. Thanks for the great service.
Guest -
December 26, 2022
Verified Purchase
Simple
Whole replacement process took 5 minutes. Product came quickly. Especially liked links to how to pages
Guest -
November 1, 2022
Verified Purchase
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
Ask our Team
We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
Does this fit my product?Questions & Answers for O-ring
I have a PC finish nailer (model DA250B). Upon removing the top cap (secured by four black screws) I turned it over and found that there is a plastic seal (nearly clear) that broken (did not need to remove any other parts to see this seal/ring). Which part number is this? (904749 ?). Thank you.
Ward
for model number DA250B
asked on 2022-04-25
Hello Ward, Thank you for contacting us. We have researched the model you have provided and have found the part you are looking for is Part Number: 904749. If you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you!
eReplacementParts Team April 25, 2022
Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
I was using the stapler when suddently there was a large air leak from the gun. .
Alan - January 8, 2016
👍 22 of 23 people found this instruction helpful
Tool Type
Stapler
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, allen wrench
Parts Used
I used an allen wrench to open the stapler (removed the 4 retaining screws) and found an obviously broken/shattered o-ring. I looked for a replacement part on the website and ordered it. The replacement was easy. My only suggestion would be to absolutely clean out any remaining o-ring parts in the stapler prior to re-installing the new o-ring. Once the new o-ring is seated, it's very difficult to remove it to allow you to remove any bits of the old o-ring that are still left.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Sudden fail in nailer with constant heavy air leaking from the top rear crown area. Result was not enough pressure to fire the nailing pin.
Josef - March 26, 2016
👍 13 of 14 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen wrench
Parts Used
Glove up. (Nitrile/Latex)
Carefully removed crown cap via 4 allen screws being mindful not to allow the spring load to force and further damage.
Inspect piston chamber for wear and adequate oiling.
Remove piston cap and O ring. (probably yellow to orange in color)
Thoroughly clean all exposed areas and RE oil.
Firmly place new O ring in place. Working with one finger around the groove while holding one side down with a thumb. It wont look like it suppose to fit, but it does.
To make things easier, you may want to completely pull the piston cap off of the crown cap.
Keep in mind the additional O rings, and placements.
Once in place, properly and moderately oil with suitable tool oil and gently push back into place while hand tightening the screws back into place.
1/8 to 1/4 turn past hand tight should be sufficient to reseal the crown into place.
Test at 30 psi and gradually increase to confirm seals before testing the firing pin.
Few more drops of oil into the chuck load and you should be complete.
Recommend full replacement of O rings and thoroughly cleaning entire unit during this repair. Highly likely all rubber O rings are failing and could probably use a blunt file to the firing pin.
Afterward it will feel like a BRAND NEW TOOL for under 20 bucks. Certainly is better than having to buy a new one at over 100!!!
Carefully removed crown cap via 4 allen screws being mindful not to allow the spring load to force and further damage.
Inspect piston chamber for wear and adequate oiling.
Remove piston cap and O ring. (probably yellow to orange in color)
Thoroughly clean all exposed areas and RE oil.
Firmly place new O ring in place. Working with one finger around the groove while holding one side down with a thumb. It wont look like it suppose to fit, but it does.
To make things easier, you may want to completely pull the piston cap off of the crown cap.
Keep in mind the additional O rings, and placements.
Once in place, properly and moderately oil with suitable tool oil and gently push back into place while hand tightening the screws back into place.
1/8 to 1/4 turn past hand tight should be sufficient to reseal the crown into place.
Test at 30 psi and gradually increase to confirm seals before testing the firing pin.
Few more drops of oil into the chuck load and you should be complete.
Recommend full replacement of O rings and thoroughly cleaning entire unit during this repair. Highly likely all rubber O rings are failing and could probably use a blunt file to the firing pin.
Afterward it will feel like a BRAND NEW TOOL for under 20 bucks. Certainly is better than having to buy a new one at over 100!!!
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Stapler would not activate, there was an air leak.
Joe - December 18, 2015
👍 6 of 6 people found this instruction helpful
Tool Type
Stapler
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen Wrench
Parts Used
Remove the top cap, exposing the underside of the piston set-up. The damaged o-ring was obvious, and the new o-ring slid easily into place. Replace the top cap and tighten the screws evenly.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Air blowing out the top of the gun
Douglas - August 3, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen Wrench
Parts Used
Removed four allen screws removed damaged o-ring and put back together. Very easy repair. The advantage of using e-replacement is the online diagnosis.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
O-Ring split, caused by over pressure.
Lorin - July 12, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen Wrench
Parts Used
1. Removed top 4 screws.
2. Remove o-ring and debris
3. oil internal components
4. replace o-ring and gasket
tighten screws tight
2. Remove o-ring and debris
3. oil internal components
4. replace o-ring and gasket
tighten screws tight
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Leaking air
James - July 10, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Parts Used
Removed the for screws from the housing cap, and removed it
Removed the worn o-ring and installed the new one
Cleaned the inside of the nail gun & oiled it
Screwed the housing cap back on
Removed the worn o-ring and installed the new one
Cleaned the inside of the nail gun & oiled it
Screwed the housing cap back on
Did you find this story helpful?
Thanks for voting and helping fellow customers!
O-ring broke.
Matt - June 19, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Parts Used
1. Removed top of nail gun.
2. Replaced o-ring.
3. Replaced top of nail gun and tested it. Worked perfectly.
2. Replaced o-ring.
3. Replaced top of nail gun and tested it. Worked perfectly.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Porter Cable BN200A Air Nailer, would not fire - massive internal air leak
K - September 7, 2018
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Removal of the cap (4 internal hex cap screws) revealed a broken O-ring. There was a gasket under the cap. I ordered the most likely parts to wear or leak. No other tools were required to disassemble enough to replace the piston seal, and another O-ring in the cap. I lubricated the O-rings and piston seal with Vaseline. After reassembly, the nailer performed like new.
Big endorsement for ereplacementparts.com. They had the parts to keep this tool in operation.
Big endorsement for ereplacementparts.com. They had the parts to keep this tool in operation.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Leak air from top.
Roberto - August 21, 2018
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen wrench
Parts Used
Remove four screws, top head , replace old broken o-ring.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
When air hose was attached unit bypassed air constantly.
Ron - August 19, 2018
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Allen wrench, Ice pick
Parts Used
Remove 4 screws from top cap, removed cap and installed new o-ring, replaced top cap and screws.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Load More Install Stories
OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Learn MoreOur product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
